Nobody is dying from the caffeine in coffee (like 50-100mg per cup). According to the NIH, LD50 of caffeine is 150-200mg/kg (so say 10g for a small person). That's like 100 cups of coffee. Even with espresso that's hard to imagine.
It would need to be in powder form or concentrated in something far beyond natural levels of coffee/tea/matcha/etc.
It would need to be in powder form or concentrated in something far beyond natural levels of coffee/tea/matcha/etc.